問題詳情
73. How many species are most important to our present food supply?
(A) Twenty.
(B) Eighty.
(C) One hundred
(D) Ten thousand.
(A) Twenty.
(B) Eighty.
(C) One hundred
(D) Ten thousand.
參考答案
答案：A
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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